Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 915 · 40 questions

How it works (Double and halve): Find the number ending in 5 and the even number. Double the one ending in 5; halve the even one. Repeat while it helps (25 → 50 → 100), then multiply.

1. 1.6 × 125 =
2. 2.8 × 25 =
3. 3.25 × 24 =
4. 4.25 × 18 =
5. 5.20 × 75 =
6. 6.25 × 6 =
7. 7.125 × 26 =
8. 8.34 × 75 =
9. 9.34 × 55 =
10. 10.35 × 12 =
11. 11.125 × 26 =
12. 12.14 × 15 =
13. 13.65 × 6 =
14. 14.65 × 36 =
15. 15.36 × 75 =
16. 16.15 × 12 =
17. 17.34 × 35 =
18. 18.6 × 125 =
19. 19.55 × 40 =
20. 20.18 × 65 =
21. 21.65 × 30 =
22. 22.12 × 125 =
23. 23.125 × 12 =
24. 24.28 × 35 =
25. 25.35 × 36 =
26. 26.12 × 15 =
27. 27.125 × 22 =
28. 28.25 × 10 =
29. 29.14 × 15 =
30. 30.125 × 28 =
31. 31.6 × 75 =
32. 32.15 × 8 =
33. 33.10 × 65 =
34. 34.20 × 25 =
35. 35.24 × 125 =
36. 36.16 × 55 =
37. 37.55 × 14 =
38. 38.18 × 125 =
39. 39.12 × 15 =
40. 40.10 × 45 =

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